2  * Backlight Lowlevel Control Abstraction
13 #include <linux/backlight.h>
21 #include <asm/backlight.h>
38  * and if it is and necessary, we're switching backlight power as well ...
300  * backlight_force_update - tell the backlight subsystem that hardware state
302  * @bd: the backlight device to update
304  * Updates the internal state of the backlight in response to a hardware event,
326  * @ops: the backlight operations structure.
328  * Creates and registers new backlight device. Returns either an
358 			WARN(1, "%s: invalid backlight type", name);  in backlight_device_register()
416  * backlight_device_unregister - unregisters a backlight device object.
417  * @bd: the backlight device object to be unregistered and freed.
451 	struct backlight_device *backlight = *(struct backlight_device **)res;  in devm_backlight_device_release()  local
453 	backlight_device_unregister(backlight);  in devm_backlight_device_release()
465  * backlight_register_notifier - get notified of backlight (un)registration
466  * @nb: notifier block with the notifier to call on backlight (un)registration
470  * Register a notifier to get notified when backlight devices get registered
480  * backlight_unregister_notifier - unregister a backlight notifier
485  * Register a notifier to get notified when backlight devices get registered
500  * @ops: the backlight operations structure
501  * @props: the backlight properties
503  * @return a struct backlight on success, or an ERR_PTR on error
514 	struct backlight_device **ptr, *backlight;  in devm_backlight_device_register()  local
521 	backlight = backlight_device_register(name, parent, devdata, ops,  in devm_backlight_device_register()
523 	if (!IS_ERR(backlight)) {  in devm_backlight_device_register()
524 		*ptr = backlight;  in devm_backlight_device_register()
530 	return backlight;  in devm_backlight_device_register()
537  * @bd: the backlight device to unregister
539  * Deallocated a backlight allocated with devm_backlight_device_register().
561  * of_find_backlight_by_node() - find backlight device by device-tree node
562  * @node: device-tree node of the backlight device
564  * Returns a pointer to the backlight device corresponding to the given DT
565  * node or NULL if no such backlight device exists or if the device hasn't
568  * This function obtains a reference on the backlight device and it is the
570  * the backlight device's .dev field.
584  * of_find_backlight - Get backlight device
587  * This function looks for a property named 'backlight' on the DT node
588  * connected to @dev and looks up the backlight device.
590  * Call backlight_put() to drop the reference on the backlight device.
593  * A pointer to the backlight device if found.
594  * Error pointer -EPROBE_DEFER if the DT property is set, but no backlight
596  * NULL if there's no backlight property.
607 		np = of_parse_phandle(dev->of_node, "backlight", 0);  in of_find_backlight()
636  * The reference on the backlight device is automatically
663 	backlight_class = class_create(THIS_MODULE, "backlight");  in backlight_class_init()
665 		pr_warn("Unable to create backlight class; errno = %ld\n",  in backlight_class_init()
688 MODULE_DESCRIPTION("Backlight Lowlevel Control Abstraction");